In other disorders, odors, tastes, or flavors may be misread or distorted. They may cause you to detect a bad odor or taste from something that is normally pleasant to taste or smell. These disorders can affect quality of life. They may also be a sign of underlying disease.

Problems with taste and smell can suggest certain health problems, such as:

Obesity

Diabetes

High blood pressure

Poor nutrition

Nervous system diseases, such as:

Parkinson disease

Alzheimer disease

Multiple sclerosis

What causes smell and taste disorders?

Some people are born with these disorders, but most are caused by:

Illness (for example, cold or flu, sinus infection, and allergies)

Head injury

Hormone changes

Dental or mouth problems

Nasal polyps

Exposure to certain chemicals

Certain medicines

Exposure to radiation therapy for head or neck cancer

Cocaine snorted through the nose

Cigarette smoking

What are the symptoms of smell and taste disorders?

Symptoms can range from the not being able to smell or taste at all to the reduced ability to smell or taste specific things that are sweet, sour, bitter or salty. In some cases, normally pleasant tastes or smells may become unpleasant.

How are smell and taste disorders diagnosed?

Along with a complete medical history and physical exam, other test may include:

Measuring the lowest strength of a chemical that a person can recognize

Comparing tastes and smells of different chemicals

"Scratch and sniff" tests

"Sip, spit, and rinse" tests where chemicals are applied to specific areas of the tongue

How are smell and taste disorders treated?

Your healthcare provider will figure out the best treatment for you based on:

How old you are

Your overall health and medical history

How sick you are

How well you can handle specific medicines, procedures, or therapies

How long the condition is expected to last

Your opinion or preference

Treatment may include:

Stopping or changing medicines that contribute to the disorder

Correction of the underlying medical problem

Surgical removal of obstructions that may be causing the disorder

Counseling

Quitting smoking

What are the complications of smell and taste disorders?

While both smell and taste disorders affect quality of life, smell disorders can be dangerous. They damage your ability to detect such things as:

Fire

Poisonous fumes

Leaking gas

Spoiled food and beverages

Taste disorders can affect nutrition and lead to weight loss and malnutrition. It can also harm the immune system and worsen other medical conditions.

Key points about smell and taste disorders

The loss of the senses of smell and taste are the most common smell and taste disorders.

Other disorders include the reduced ability to smell or taste specific substances that are sweet, sour, bitter or salty.

For some people, normally pleasant tastes or smells may become unpleasant.

Treatments for smell and taste disorders often include treating the underlying cause.

Smell and taste disorders can affect quality of life and should be treated.

Next steps

Tips to help you get the most from a visit to your healthcare provider:

Know the reason for your visit and what you want to happen.

Before your visit, write down questions you want answered.

Bring someone with you to help you ask questions and remember what your provider tells you.

At the visit, write down the name of a new diagnosis, and any new medicines, treatments, or tests. Also write down any new instructions your provider gives you.

Know why a new medicine or treatment is prescribed, and how it will help you. Also know what the side effects are.

Ask if your condition can be treated in other ways.

Know why a test or procedure is recommended and what the results could mean.

Know what to expect if you do not take the medicine or have the test or procedure.

If you have a follow-up appointment, write down the date, time, and purpose for that visit.